![]() ![]() Example:Īgain not the simplest of projects to take on, put certainly could be a useful one if actually accomplishable with reasonable costs and size. Perhaps an arduino controled 'motorized pot' as used in stereo equipment could be used with the motorized pot replacing the blue pot in that module? Of course the motorized pot variable resistor range would have to be of the same ohm range (and have a linear 'taper' Vs 'log taper') as the pot used in the regulator module and you probably would need a second pot 'gang' on the motorized pot to give position feedback to the arduino and of course finally you would need a motor H-drive to power the motor on the pot. So not saying it can't be done (arduino controlling output voltage value of this regulator) but it would be a project for someone with good experience in electronics. In contrast, examples of isolated converters are Push-pull, Forward, Flyback, Half-Bridge and Full-Bridge converters. Examples of non-isolated DC-DC inverters are Buck, Boost, Buck-Boost, Cuk and SEPIC converter. Using an arduino to read the output voltage of the module and apply a nominal (but adjustable) 1.23 adjustable voltage (say from a low pass filtered PWM output pin) to the regulator feedback pin might work in theory but I think you would have problems with the low resolution of the standard arduino PWM command (only 256 step values and only a few counts would be in the 'control range' of the module as there is most likely a high 'gain factor'. In other words, a non-isolated DC converter converts DC input directly into DC output. The current requirement to drive the feedback input pins is quite low so that is not a problem, but trying to replace the R2 component with a digital pot IC may run into a voltage limit size as the digital pot would have to be rated to handle the maximum rated output voltage you plan on running the regulator at. The bottom example in figure 8 shows the adjustable version and the calculation needed for the external voltage divider resistors (in your case one fixed R1, and one adjustable R2). Boost-Buck Converter Circuit Schematic The voltage detected by the DC voltage sensor is processed by a microcontroller in the form of an Arduino Mega 2560. The ebay module you linked too is of course the adjustable version and uses that multiturn pot to set the output voltage. While the function of the buck converter is to reduce 2 to which is used for battery charging voltage. Keep in mind that this regulator comes in either various fixed voltage output or an adjustable voltage output. will be wasted.Īlso, besides these, you can just use the 12 V battery output to directly power your Arduino board through its power jack, which means you would not need to reduce 12 V into 6 V, if it was only for powering your board.Here is the datasheet for the voltage regulator: For example, if you want to make a 6 V output from 12 V input, your efficiency will be approximately Vout/Vin = 6 V/12 V = 0.5 = 50%, which means half of the power your battery supplies will be dissipated as heat, e.g. However notice that, when you are using a linear regulator your efficiency will not be very good. As you may know, two PWM outputs of Arduino Uno are linked to the. Because there is an abundance of authentic information on this topic, I didn’t dive too deep here. inductors, capacitors, diodes, FETS) you can just use a linear regulator with 6 V output regulation.Īs a choice for linear regulator, I can suggest using MC7806 ( ), which will give you 6 V constant output voltage easily, or I can suggest using LT1086 ( ) which can give you 5 V constant output easily or an adjustable output which you can set to 6 V. This interleaved trick is very useful in many different applications, such as charge pump gate drivers, buck/boost power converters, H-bridge controllers, etc. They have a non-linear cooling coefficient depending on dt and current supply, so I would like to program that logic in a microcontroller (Arduino) and make a variable power supply essentially (0-7V. ![]() However if you want a simple solution, I mean if you don't want to mess up with a lot of external components (e.g. The manufacturer states that optimally, you should drive these with regulated voltage and not PWM. In this example, the converter is feeding an RC load from a 200. ![]() In continuous conduction mode (current through the inductor never falls to zero), the theoretical transfer function of the buck converter is: where is the duty cycle. If you want to go with LM3485 or any other switching buck controller, you will need a bunch of external components, but this will give you really good power efficiencies (probably more than 90%, if implemented correctly). A buck converter is a DC/DC power converter which steps down voltage from its input (source) to its output (load). ![]()
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